(3+max[3，(1-0.8)×18])
    X×X-14.5X+25＝0
    186000/x＋2x－50000/x＝12
    X/87-（100-X）/500=0.131
    X/87-（100-X）/500=0.107
    (5x)^2+(2sqrt(11))^2=(6x)^2
    36+(8-x)^2=x^2
    x^2+4^2=(8-x)^2
    x^2+2^2=(8-x)^2
    (3-x)^2+1=x^2
    （140-100-a）（300-2a）=1200
    1000*1.5^x=350000
    200*1.5^x=350000
    arctan0.5x+arctan0.2x=90
    3√6=(xx+2x+3)/x
    3√6=x
    x/(x+587)=0.59
    x/(x+587)=0.64
    x/(x+587)=0.69
    arctanx+arctan0.5x=90

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